Electric razor with helical filament winding

Abstract

A roller assembly for an electric razor includes a generally cylindrical roller driven by a drive arrangement to rotate about a central axis. The roller supports a number of blades, each having a cutting edge externally exposed and extending parallel to the central axis. Each blade moves across the skin of a user so as to slice through hair projecting from the skin of the user. The roller assembly further includes at least one filament wond in a helical path around the roller such that a gap between adjacent portions of the filament along the cutting edges is no more than about 8 millimeters.

Description

FIELD AND BACKGROUND OF THE INVENTION [0001] The present invention relates to electric razors and, in particular, it concerns an electric razor with one or more exposed-blade rotating roller which employs a filament wound in a helical configuration around the rollers. [0002] This application relates primarily to an electric razor of a type generally similar to that described in co-assigned U.S. Pat. No. 6,442,840 which is hereby incorporated herein in its entirety. In all respects other than those addressed explicitly in this document, the structure and operation of the razor should be understood to be as described in the aforementioned document. [0003] The aforementioned electric razor is unusual in that it crosses the boundaries of the generally accepted criteria which distinguish electric razors from manual razors. Specifically, in most cases, electric razors employ a scissors-like cutting action between moving blades and a thin perforated foil or other stationary skin-contact su...

AI Technical Summary

Benefits of technology

[0017] According to a further feature of the present invention, an outer surface of the roller is formed with an array of alignment features deployed along a length of the roller parallel to the cutting edges, the alignment features being configured to engage windings of the filament so as to prevent migration of the filament along the roller.

Problems solved by technology

Since the wire wrapping around the blades is aligned with the direction of travel of the blades, it tends to cause a “shadow”, i.e., leaves tracks along the paths traveled by the wires where the blades did not have access to the hairs.

Furthermore, the wires do not contribute to the lifting of hairs during the shaving process.

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